Hi, I have been looking around for a solution that can help me in getting a list of invoices in a drop-down list based on the partner selected and the line item name = 'CD Break', I tried this code but I only get the list of invoices based on the partner and not the line, also I need to use another field for showing the invoices and not the POS number. Please help following is my python code and the xml file:

class new_test(osv.osv):
    _name = 'new.test'    


    def _sel_func(self, cr, uid, context=None):
        obj = self.pool.get('account.invoice')
        ids = obj.search(cr, uid,[],context=context)
        res = obj.read(cr, uid, ids, ['name', 'id'], context)
        res = [(r['id'], r['name']) for r in res]
        return res


    _columns ={
                'partner_id': fields.many2one('res.partner', 'Partner', change_default=True,required=True,),
##                'invoice_id': fields.function(_get_invoices, type='many2one',relation='account.invoice',string="Invoices",store=True,readonly=False),
                'pinvoices': fields.many2one('account.invoice','CD Break Invoice',domain="[('partner_id', '=', partner_id),('invoice_line', 'ilike', 'CD Break')]",selection=_sel_func),
}
    def remove_penalty(self, cr, uid, ids, context=None):
        res = {}
        name = 'CD Break'
        for penalties in self.browse(cr,uid,ids,context=context):
            if penalties:
                pid = penalties.partner_id.id
                number = penalties.pinvoices.serial_number
                invoice_id = penalties.pinvoices.id
                raise orm.except_orm(_(''), (str(number)))
                cr.execute("DELETE FROM account_invoice_line WHERE name=%s and invoice_id=%s", (name,invoice_id))
                cr.execute("DELETE FROM account_move WHERE name=%s and invoice_id=%s", (name,invoice_id))

        return res

new_test()

XML:

<?xml version="1.0" ?>
<openerp>
    <data>

        <record id="view_new_test_form" model="ir.ui.view">
            <field name="name">new.test.form</field>
            <field name="model">new.test</field>
            <field name="type">form</field>
            <field name="arch" type="xml">
                <form string="New test" >
                    <field name="partner_id"/>
                    <!-- <field name="invoice_id"/>  -->
                    <field name="pinvoices" />
                    <separator colspan="4" string="Actions" col="2"/>
                    <button name="remove_penalty" string="Remove Penalty" type="object" icon="gtk-execute"/>
                    <button name="" string="Cancel" type="object" icon="gtk-cancel"/>


                </form>
            </field>
        </record>

        <record model="ir.actions.act_window" id="action_new_test_form">
            <field name="name">New Test</field>
            <field name="res_model">new.test</field>
        </record>          



        <menuitem name="TEST" id="menu_new_test"/>
        <menuitem name="New Test" id="menu_test" parent="new_test.menu_new_test" action="action_new_test_form" sequence="1"/>


    </data>
</openerp>